JConsole can't find process

Question

I tried to run JConsole to analyze the memory used by a running process, but JConsole doesn't show me processes even though I am absolutely sure that one is running (in addition to that it should show JConsole in the process list as well but it doesn't).

Does anyone have an idea why it doesn't show any processes?

Cheers

score 17 · Answer 1 · edited Jun 04 '20 at 16:39

17

at window prompt, run echo %TMP%, it will give you default temp dir. Go to that directory and find directory named hsperfdata_user where user is your login. This is directory to store your process id. Any new process you created such as java application will have a new file named by process id. Jconsole will pick up the process ids from this directory. If you cannot create a file in this directory, that means you need change permission to allow write. Once done that, start a new java application to see if new process id file is in the dir. Once confirmed, start jconsole

edited Jun 04 '20 at 16:39

geert3

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answered Oct 18 '13 at 18:44

james liao

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If the java process is started from cygwin it will have a different TEMP folder than expected - jconsole, started from explorer wont find the process then. – Kai Jan 27 '14 at 23:48
Thanks James! Fixing the permissions worked for me! :) – baraka Jan 28 '15 at 12:19
from cygwin prompt, needed to `export TMP=/cygdrive/C/Users/xxx/AppData/Local/Temp` – geert3 Jun 04 '20 at 17:05
In most cases, running JConsole as an Administrator will do the trick – Anu Shibin Joseph Raj Feb 22 '21 at 01:04
This answer helped me with VisualVM too. So anyone who has the problem of not showing your local process in Visualvm's application list also should try this. – Jagath01234 Sep 23 '21 at 10:48

score 14 · Answer 2 · edited Mar 21 '13 at 16:30

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I have the same problem. But if I explicitly specify the PID, as in jconsole 1234, jconsole is able to analyze the process.

edited Mar 21 '13 at 16:30

Steve Westbrook

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answered Mar 21 '13 at 15:58

user2195918

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Can you provide more details on how you do this? – Steve Westbrook Mar 21 '13 at 16:18
@SteveWestbrook, Open a terminal, and instead of running "jconsole", run "jconsole 1234" where 1234 is the PID of your Java process. Now as to how to find the PID of your Java process, you can do it via Task Manager in Windows or by running "ps ax" in Linux.. – Anu Shibin Joseph Raj Feb 22 '21 at 01:01

score 9 · Answer 3 · edited Jan 04 '18 at 18:19

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If you are running jconsole on windows - simply :

Find jconsole.exe
Right click it
Select run as administrator.

edited Jan 04 '18 at 18:19

Imene Noomene

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answered Jan 04 '18 at 16:21

RoyalBigMack

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score 3 · Answer 4 · answered Dec 04 '14 at 13:13

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In my case, removal of hsperfdata_USERNAME directory (in %TMP% directory) and closing all the JVMs has helped.

answered Dec 04 '14 at 13:13

Łukasz K

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score 1 · Answer 5 · answered Sep 08 '14 at 22:52

This happens when %TMP% value is different for monitored JVM and the monitoring tool (JConsole/JMC/Java Mission Control, maybe even VisualVM). This may be the standard scenario with Cygwin (at least in my case: Cygwin+Babun) Easiest solution is to set value of the TMP environment variable to the default value used by Windows, at least in scope of shell launching the JVM.

score 1 · Answer 6 · answered Dec 25 '16 at 07:29

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You have to start jconsole with the same user as the process you want to analyze is started by.

answered Dec 25 '16 at 07:29

mibutec

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Even i am running from same user still i am not able to run jconsole. – Gautam Oct 01 '17 at 06:22
Tried this, jconsole is still not seeing my process – Harvey Lin Dec 31 '19 at 21:22

score 1 · Answer 7 · answered Mar 11 '20 at 02:10

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Just ran into this issue

If you are using multiple jdk's by any chance (ex. SDKMAN), then make sure that jconsole is run using the same jdk as the application

answered Mar 11 '20 at 02:10

jrhee17

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score 1 · Answer 8 · edited Sep 17 '20 at 18:43

8 years later... I had the same problem. I could only see certain processes but couldn't see and monitor any java processes running in a docker container in Linux.

Inspired by the Windows solution by RoyalBigMack:

Solution 1. Run terminal as super user (su command) and run jconsole
Solution 2. Run solution 1 as one command, sudo jconsole

Only the first solution worked for me, and once the jconsole UI popped up- all the hidden processes were now visible.

JConsole can't find process

8 Answers8

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